[System.Data] move to corefx (#4893)

[System.Data] move to corefx (#4893)

* [System.Data] move to corefx

* [System.Data] Missing API: SqlTypesSchemaImporters

* [System.Data] Missing API: SqlNotification*

* [System.Data] Missing API: SqlDataSourceEnumerator

* [System.Data] Missing API: SQLDebugging

* [System.Data] fix build

* [System.Data] remove public API from different assemblies

* Apply corefx changes

* Hide some PropertiesTest (missing API in corefx)

* Missing API: TypedDataSetGenerator*, etc

* Missing API: SqlClientMetaDataCollectionNames

* Missing API: SqlCredential

* SqlMetaDataFactory.cs is actually sqlmetadatafactory.cs (case sensitive)

* Missing API: PoolBlockingPeriod

* Fix case-sensitive issues

* Odbc support (requires changes in corefx)

* ODBC support

* Re-enable ODBC ProviderTests

* Apply corefx changes

* temp commit: fix build

* Missing API: Microsoft.SqlServer.Server.*

* Missing API: DBDataPermission, OdbcPermission, SqlClientPermission

* Missing API: DbProviderFactoriesConfigurationHandler, DbProviderConfigurationHandler, DbProviderFactory.CreatePermission

* Missing API: DbProviderFactories

* Missing API: SqlCommand BeginXXX methods, SqlException.Message, OdbcFactory.CreatePermission

* Add System.Data.SqlClient.SqlMetaData.xml (embedded resource)

* reorganize *.sources files for win32, macos and linux

* bump corefx

* [System.Data] API: SqlDataSourceEnumerator, SqlClientFactory, SqlParameter, SqlMetaData

* [System.Data] cleanup

* [System.Data] mobile profile, cleanup

* [System.Data] Fix few odbc tests (changes are in corefx PR)

* [System.Data] fix Open_ConnectionString_DatabaseInvalid test

* [System.Data] enable all tests

* Add AsynchronousProcessing and ConnectionReset to SqlConnectionStringBuilder

* [System.Data] fix build

* fix all ProvierTests

* fix tests (files several issues against the corefx)

* system-data code cleanup

* system-data code cleanup

* add SqlTypesSchemaImporters

* remove corefx/RuntimeInformation.cs, add OleDbPermission stub

* OleDbPermission should be serializable (fixing tests)

* remove ODBC from mobile profile

* fix linux build - add 619 (obsolete) to nowarn list.

* temp commit

* fix a few api diff issues

* add OleDbType type (currently exists even in mobile profiles)

* add stubs

* Add stubs for OleDb

* improve oledb stubs

* improve oledb stubs

* improve oledb stubs

* more oledb stubs

* add xunit tests from corefx

* Add SqlClient corefx tests

* use corefx sources for System.Data.DataSetExtensions

* Remove [InternalsVisibleTo ("System.Data.DataSetExtensions")] from System.Data

* [System.Data] sync with external/corefx

* fix linux\macOS builds

* Fix xunit tests

* System.Data/Makefile cleanup

* tabify System.Data

* Rollback changes in System.Web & SqlSharpCli

* small cleanup

* [System.Data] Remove redundant .sources files

* [System.Data] update odbc Res.cs

* [System.Data] Remove redundant .sources files

* fix System.Data.dll.sources (add a blank line)

* remove TypeForwarder for DBNull and register xunit tests for System.Data

* Bump API snapshot submodule